A Study on Cyclic Deformation and Fatigue Phenomenon of Shape Memory Alloy

J. Ocean Eng. Technol. 1992;6(1):87-95.

형상기억합금의 반복변형특성과 피로현상에 관한 연구

박영철,오세욱,허정원,이명렬

동아대학교 기계과,동아대학교 기계과,동아대학교 기계과,동아대학교 기계과

Keywords: Shape Memory Alloy, Shape Memory Effect, Martensite Transformation, Cycle Deformation

핵심용어: 형상기억합금, 형상기억효과, 마르텐사이트 변태, 반복변형

Abstract

Recently, the robot actuator worked by the driving recovery-force of the thermo elastic martensitic transformation of shape memory alloys(SMA) has been studied. In general, such a SMA actuator necessitates a number of cyclic repeated motion, so that the investigation of gradual decrease of recovery force with repeated motion cycle as well as the prevention of such a degradation of shape memory effect(SME) are very important for the actual use of a robot actuator. However, such research and discussions about the degradation of SME are very few up to the present. Therefore, in this study, the characteristics of the cyclic deformation and degradation of SME of Ti-Ni alloy would be investigated and discussed in detail by current heat type fatigue tester, which is a newly designed fatigue tester by author. In addition, we will establish a new design concept for robot actuator from these result.